JPS5924820A - Optical recorder - Google Patents

Abstract

PURPOSE:To eliminate the need for disposing a driving system for a rotary polyhedral mirror in the upper position of a photoreceptor and to make the device compact in a height direction, by setting the position of the revolving shaft of the rotary polyhedral mirror on the outside of the transverse region of the photoreceptor. CONSTITUTION:The length in the revolving axis direction of pulleys 121, 122 which are the revolving axes of a photoreceptor is the width of the photoreceptor 12. The beltlike region obtd. by extending said width is the transverse region of the photoreceptor, and the position of the revolving shaft 81 of a rotary polyhedral mirror 8 is set on the outside of the transverse region of the photoreceptor. Therefore, the driving system for the mirror 8 can be disposed in roughly the same height position as the height of the photoreceptor 12. Even if the shaft 81 of the mirror 8 is made long, the height of the optical recorder is made compact.

Description

[Detailed description of the invention] The present invention relates to an optical recording device.

A method in which a light beam whose intensity is modulated by an image signal corresponding to the image pattern to be recorded is periodically deflected by a rotating polygon mirror, and a drum-shaped or belt-shaped photoreceptor is line-scanned by the deflected light beam. Optical recording devices are known.

One of the criteria for improving such optical recording devices is the problem of making the device more compact, and various proposals have been made to make the device more compact, but it is difficult to make the device more compact in the height direction. There was a problem. Here, the height direction of the device is the direction of the rotation axis of the rotating polygon mirror.

An object of the present invention is to provide an optical recording device that can be made compact in the height direction of the device.

The present invention will be explained below.

Conventionally, there are two reasons why it has been difficult to make optical recording devices more compact in the height direction. One of these is that in order to make the device more compact in the width and depth directions, a rotating polygon mirror has conventionally been disposed close to the photoreceptor at the center of the photoreceptor in the direction of its rotational axis. If you try to realize this kind of deployment, you will need to install a charger, etc. around the photoreceptor.
Since a developing device and the like are provided, the rotating polygon mirror drive system has to be placed above the photoreceptor due to layout considerations.

The second cause is the high height of the rotating polygon mirror and drive system. That is, in order to perform proper line scanning of the photoreceptor, the rotating polygon mirror is required to have a strict precision in its surface tilt. If an attempt is made to reduce the height of the rotating polygon drive system by reducing the spacing between the bearings that support the rotating shaft of the rotating polygon mirror, the accuracy of surface tilting will be reduced due to play in the bearings.

For this reason, the rotating polygon mirror drive system requires a certain level of height. Since such a drive system is disposed above the photoreceptor, the height of the optical recording device inevitably becomes large, making it difficult to make it compact.

Therefore, in the present invention, in order to solve this problem, the rotation axis position of the rotating polygon mirror is set outside the photoreceptor width region.

The length of a drum-shaped or belt-shaped photoreceptor in the direction of the rotation axis is called the width of the photoreceptor.

Consider a plane that is perpendicular to the rotation axis of the rotating polygon mirror and includes the rotation axis of the photoreceptor. On this plane, match the photoreceptor and take the width of the photoreceptor as the length.

Then, consider a band-shaped region on the above-mentioned plane whose width is the above-mentioned length. This strip-shaped region is the photoreceptor width region.

In this way, by setting the rotation axis position of the rotating polygon mirror outside the photoconductor width area, it is no longer necessary to install the rotating polygon mirror drive system above the photoconductor, so that the optical recording device can be
It can be effectively made compact in the height direction.

Hereinafter, with reference to the drawings, in accordance with specific examples,
The present invention will be explained.

FIG. 1e shows, in a plan view, mainly the arrangement of the concave portions of an optical recording apparatus embodying the present invention. 1
First, to explain each symbol, numeral 1 is a laser light source as a light beam, numeral 2 is a mirror, numeral 3 is a third lens,
4 is an AO element (acousto-optic element) as a modulator, 5 and 6 are mirrors, 7 is a second lens, 8 is a rotating polygon mirror, 9 is an fθ lens, 10. II is a mirror, 12 is a photoreceptor, 13 is a mirror, 14
indicate the light-receiving elements, respectively.

Light beam Bi emitted from racer light source 1, mirror 2
When reflected by the mirror 5.6, it enters the second lens 7, becomes a convergent light beam, enters the AO element 4, passes through this, becomes a diverging light beam, is reflected by the mirror 5.6, and is reflected by the second lens 7. incident on . After being converted into a parallel light beam by the second lens 7, the light beam enters the rotating polygon mirror 8, is reflected by the same polygon mirror 8, enters the fθ lens 9, and is transmitted through the mirror 10. 11, and the photoreceptor 1
2 to be led above. Light beam B guided onto photoreceptor-12
is focused onto the photoreceptor 12 by the action of the fθ lens 9. The direction of the rotation axis 81 of the rotating polygon mirror 8 is a direction perpendicular to the drawing in FIG.

The photoreceptor 12 is in the shape of an endless belt, and has the shape of an endless belt.
1 and 122, and rotates cyclically as these pulleys rotate, but the direction in which the peripheral surface of the photoreceptor moves due to this rotation is directed to the right in the figure. Photoreceptor 12
The direction of the rotation axis of Boo'J-121, 122 is the vertical direction in FIG.
The band-shaped area extending in the left-right direction in the drawing is the photoreceptor width area, and the position of the rotating polygon mirror 80 rotation shaft 81 is set outside the photoreceptor width area as shown in the figure.

When the rotating polygon mirror 8 is rotated at a constant angular velocity in the direction of the arrow, the beam reflected by the rotating polygon mirror is periodically deflected.

In this periodic deflection, the reflected beam is
Change its direction so that it rotates clockwise,
At the beginning of each deflection period, the light beam transmitted through the fθ lens 9 enters the light receiving element 14 via the mirror 13. When the light receiving element 14 receives this light, it emits a signal, and the optical scanning of the photoreceptor 12 is synchronized by this signal.

Now, while rotating the photoreceptor 12, the light beam B is
When the intensity is modulated by the image signal in the element, the photoreceptor 12 is line-scanned by the light beam B.

In FIG. 1, reference numerals indicate scanning lines by light beam B. In FIG.

FIG. 2 shows the state of FIG. 1 viewed from the right. The fθ lens 9 has a rectangular shape as shown in the figure.

The rotating polygon mirror 8 has a rotating shaft 81 supported by a bearing flj13, and is rotated by a rotor 84 and a stator 85.

Since the position of the rotating shaft 81 of the rotating polygon mirror 8 is set outside the width area of the photoreceptor, the rotating polygon mirror drive system is connected to the photoreceptor 12.
It can be placed at approximately the same height as the Therefore, even if the rotation axis 81 of the rotating polygon mirror 8 is lengthened, the height of the optical recording device can be made more compact.

FIG. 3 shows the optical recording apparatus shown in FIGS. 1 and 2 as viewed from the front side. In this figure, the rotating polygon mirror is located at the back, and therefore the rotating polygon mirror and its drive system do not appear in this figure.

A charger 15 and a developing device 1 are installed around the photoreceptor 12.
6, a transfer charger 17, a static eliminator 18, and a leaning device 19 are provided.

The recording sheets S are stacked on support plates 29 and 30. Reference numeral 28 indicates a presser lid. The support plate 29 receives an upward force from a push-up means (not shown), and the tip of the uppermost recording sheet S comes into pressure contact with the delivery roller 20 due to the action of this push-up force.

To the left of this delivery roller 20 is a registration roller 22.
A guide 22 is provided between the registration roller 22 and the transfer section.

A guide 23, a fixing roller 24, a guide 25, and a discharge roller 26 are provided toward the upper left from the transfer section. Reference numeral 27 indicates a tray, and the chain line indicates the first line of the apparatus.

When the device is operated, the photoreceptor 12 rotates clockwise,
The static eliminator 18 and the cleaning device 19 operate to clean the photoreceptor 1.
2 static elimination and cleaning are performed.

Next, the photoreceptor 12 is uniformly charged by the charger 15, and is line-scanned by the light beam B.
An electrostatic latent image corresponding to an image pattern according to the image signal is formed.

This electrostatic latent image is visualized by the developing device 16. On the other hand, when the recording sheet S is sent out by the delivery roller 20, its leading end is held by the registration rollers 22.

The registration rollers 22 send the held recording 7-to S to the transfer section through the □ guide 22 at intervals of the movement of the visible image on the photoreceptor 12. In this way, the recording sheet S is superimposed on the visible image in the transfer section, and after the visible image is transferred by the transfer charger 17, it is separated from the photoreceptor 12 and guided to the fixing section by the guide 23.
After the visible image is fixed by the fixing roller 24, it passes through the guide 25 and is discharged onto the tray 27 by the discharge roller 26.

After the visible image has been transferred, the photoreceptor 12 is neutralized by a static eliminator 18 and then cleaned by a cleaning device 19. The recording process is thus completed.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the writing section of an optical recording device embodying the present invention, and FIG. 2 is a diagram schematically showing the state of FIG. 1 viewed from the right. FIG. 3 is a diagram schematically showing the optical recording apparatus shown in FIGS. 1 and 2 as viewed from the front side. 1... Laser light source, 4... AO element, 8...
・・Rotating polygon mirror, 81 ・・Rotation axis of rotating polygon mirror, 9
...fθ lens, 10.11...mirror, 12...
Photoreceptor, 15...charger, 16...developing device,
17...Transfer charger, 24...Fixing roller, S...Recording sheet.

Claims (1)

[Claims] A light beam whose intensity is modulated by an image signal corresponding to an image pattern to be recorded is periodically deflected by a rotating polygon mirror, and the deflected light beam is applied to a drum-shaped or belt-shaped photoreceptor. 1. An optical recording device of a line scanning type, characterized in that the rotation axis position of the rotating polygon mirror is set outside the photoreceptor width area.